Former tennis star, Jennifer Capriati is being accused of stalking and assaulting her ex-boyfriend, Ivan D. Brannan Jr., and while she's been ordered to appear in court April 17, if she doesn't attend her hearing, she's gonna receive a warrant out for her arrest!!

According to a witness, Miz Capriati apparently creeped up on her former beau on Valentine's Day at the Oxygen Health & Fitness Gym in North Palm Beach, where she screamed at Ivan and punched him in the chest FOUR times.

And if you thought that was insane, Capriati also went to Brannan's job, where she slammed her fists against a window, yelled, paced and tried to bust open a locked door. After seeing how cray the tennis star was acting, one of Ivan's co-worker's immediately called police, and let them know that Jennifer had also called the business 50 times.

However, even after people stated that they saw homegirl acting out, Jen's attorney, Richard Lubin is saying that these accusations are FALSE, he notes:

“Unfortunately, false accusations against celebrities is an almost daily occurrence in the world we live in. Jennifer Capriati is innocent of these charges, and we intend to vigorously defend her name against this nonsense."

Hmm… considering that the police report is articulating that Capriati did “willfully, maliciously, and repeatedly follow, harass, or cyberstalk” Brannan, then we're not sure if her lawyer is being honest.

After all, Jennifer was once arrested for shoplifting and having marijuana in her possession, so she seems pretty wacky to us!!

"My metabolism actually changed like crazy this year. I have Hashimoto's disease. It's a thyroid disease, and it's now been two years since taking the medication for it, so for the VS show I didn't want to lose any more weight, I just want to have muscles in the right place, and if my butt can get a little perkier, then that's good."